메타 문자 "^"는 특정 문자열의 시작 부분과 일치합니다. 즉, 문자열의 첫 번째 문자와 일치합니다. 예를 들어,
-
표현 "^\\d "는 숫자로 시작하는 문자열/라인과 일치합니다.
-
표현 “^[a-z] "는 소문자 알파벳으로 시작하는 문자열/라인과 일치합니다.
예시 1
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String args[]) { //Reading String from user System.out.println("Enter a String"); Scanner sc = new Scanner(System.in); String input = sc.nextLine(); String regex = "^[^a-zA-Z0-9//s].*"; //Compiling the regular expression Pattern pattern = Pattern.compile(regex); //Retrieving the matcher object Matcher matcher = pattern.matcher(input); if(matcher.matches()) { System.out.println("Match occurred"); } else { System.out.println("Match not occurred"); } } }
출력
Enter a String #starting with a special character Match occurred
예시 2
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main( String args[] ) { String regex = "\\.$"; Scanner sc = new Scanner(System.in); System.out.println("Enter 5 input strings: "); String input[] = new String[5]; for (int i=0; i<5; i++) { input[i] = sc.nextLine(); } //Creating a Pattern object Pattern p = Pattern.compile(regex); for(int i=0; i<5;i++) { //Creating a Matcher object Matcher m = p.matcher(input[i]); if(m.find()) { System.out.println("String "+i+" ends with '.'"); } } } }
출력
Enter 5 input strings: hello how are you. where do you live what is your name. welcome to tutorialspoint The Biggest Online Tutorials Library. String 0 ends with '.' String 2 ends with '.' String 4 ends with '.'
예시 3
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main( String args[] ) { String regex = "^[A-Z]"; Scanner sc = new Scanner(System.in); System.out.println("Enter 5 input strings: "); String input[] = new String[5]; for (int i=0; i<5; i++) { input[i] = sc.nextLine(); } //Creating a Pattern object Pattern p = Pattern.compile(regex); for(int i=0; i<5;i++) { //Creating a Matcher object Matcher m = p.matcher(input[i]); if(m.find()) { System.out.println("String "+i+" starts with a capital letter"); } } } }
출력
Enter 5 input strings: Sample text1 sample text2 hello how are you Welcome to tutorialspoint Good morning String 0 starts with a capital letter String 3 starts with a capital letter String 4 starts with a capital letter